Martin Donisthorpe Armstrong (2 October 1882 – 24 February 1974) was an English writer and poet, known for his stories.
[1] Armstrong was born in Newcastle upon Tyne, and educated at Charterhouse and Pembroke College, Cambridge.
During World War I he volunteered with the British Army and served in France as a Private in the Artists' Rifles.
He married in 1929 Canadian writer Jessie McDonald after she had divorced Conrad Aiken, making Armstrong the stepfather of the young Joan Aiken.
He appears in disguised form as a character in Conrad Aiken's Ushant.